A new trailer for Battlefield 4 follows the recent mini-tease with an actual tease, as the clip runs a full 20 seconds (break out the popcorn) and concludes with word once again to expect the full version of this trailer on March 27th. In the meantime the clip shows a ship's propeller spinning up, which goes with the trailer's title, "Prepare 4 Battle: Sea," to further suggest the next installment in DICE's military series will feature an increased emphasis on naval combat.

don't think it's a sub propeller. around 10 seconds, you can see the drive shaft, and around 12 seconds you can see the curve of the ship's hull in the background. and the trailer is titled 'sea' so it's probably just referencing surface naval warfare, which would still be awesome.

Like that awesome part in BF3 where you take off from the carrier..so much mood, atmosphere & tension. In the real game..not so much. I miss BF1 where you could jam the carrier up onto wake island..so it was a bug but fun as hell!!!!!!

It was just a guess, this may be a boat, not sure. The first trailer starting out with water vehicles, this might suggest that they will focus more on sea warfare this time around not only land and air.

The teaser of a trailer is pretty disappointing though. Why can't they just release a damn trailer of some actual gameplay, which is what everyone interested to see. This is the 2nd teaser of a trailer. Not sure why this is necessary, I am sure people who are looking forward to this game won't get more hyped by teasers of a trailer. Those not interested in this game the begin with, these 20 second teasers will not change their mind, if anything these will turn more people off, because they are annoying.